The only other known photo shot at Maplecroft was taken outside on the piazza and is of Lizzie and her dog on the back porch.

The recently acquired sepia-colored image that dates to Victorian times is being kept confidential until it is unveiled Monday. It is of a subject matter that was obviously dear to Lizzie.

The photo offers a small yet first-ever look inside the house, now known as Maplecroft, that Lizzie shared with her sister, Emma, after she was acquitted in the killings of her father and stepmother.

The image was taken by an unknown photographer and then framed by Edward S. Wright at 45 N. Main St., according to the now brown and thin paper label behind the original frame.

Martins said the photograph, donated to the society earlier this year, has been authenticated.

“It has to be what it is purported to be without a shadow of a doubt,” Martins said.

Lizzie, around 1899, gifted the photograph to her personal maid Ida S. Carlson who was getting married to Bennett Peter Soderman. The details as to why Lizzie gave Carlson the photograph are lost to history.

When Carlson passed, the photograph was acquired by a relative, whose descendant donated it to the society.

“Once we uncover these items, we make them available publicly,” Martins said.

The same person also donated Lizzie’s 14-karat gold American Waltham Watch Co. watch in a hand-engraved case in 2009. The watch was bequeathed by Lizzie in 1927 to Carlson’s daughter, Alice Isabel Soderman.

The pocketwatch will also be on display at the society, along with other items in the “Echoes of Lizzie” special exhibit running Monday through mid-October.

There will be rare and recently discovered personal and business correspondence related to Lizzie, including Borden investment materials, and a note from Emma Borden to a friend in 1907.

“It tells us what she was thinking at the time,” Martins said.

Also on display will be original crime scene photographs and trial exhibits, a hatchet missing its handle that was found the day of the crime and other items.

“We try to debunk some of the myths and present the facts,” Martins said.

Also starting Monday, raffle tickets will go on sale for a rare copy of “The Commonwealth of Massachusetts -vs- Lizzie A. Borden: The Knowlton Papers 1892-1893” by Michael Martins and Dennis Binette.

“The Knowlton Papers” was the first collection of primary-source documents on the Borden case to ever appear in print. The Fall River Historical Society published the groundbreaking work in 1994 in a limited edition of 1,000 copies.

Martins said it is among the most sought-after books on the Borden case and rarely, if ever, appears on the market in its original, unopened packaging.

This uncirculated copy is valued at $350. Raffle tickets are $5 each and can be purchased at the society or by calling 508-679-1071, extensions 1 or 2. The drawing will be held in October.

Tours of the society, at 451 Rock St., on Monday will be offered every 45 minutes from 9 a.m. to 3:15 p.m., except from noon to 1 p.m. Admission is $8 for adults and $6 for children.